Annual Incidence Rate of Visual Field Abnormalities Determined by Frequency Doubling Technology Perimetry
Journal Title: Journal of Preventive Medicine and Care - Year 2016, Vol 1, Issue 2
Abstract
Purpose: To determine an appropriate time interval for conducting mass screening for glaucoma, it is important to gather information on the annual incidence rate. Thus, a retrospective cohort study was conducted to determine the annual incidence rate of visual field abnormalities (VFA) among a workplace cohort. Methods: In an initial visual field test using frequency doubling technology (FDT) perimetry conducted on 3443 employees (mean age 47.4 ± 8.9, men/women = 2967/476), no abnormalities were observed. Subjects were followed-up with annual perimetric testing for seven years, with VFA being determined using FDT test (FDT-VFA). Results: Using theKaplan–Meier method (log rank test, p < 0.001), cumulative FDT-VFA rates (SE) at seven years for subjects in their 30s, 40s, 50s, and 60s or older were found to be 3.0% (0.6), 4.2 % (0.6), 4.8 (0.8), and 11.3% (0.2), respectively. A linear fit to the Kaplan–Meier results yielded an annual incidence rate of 0.42%, 0.60%, 0.77%, and 1.60% for the 30s, 40s, 50s, and ≥60s age groups, respectively. Conclusion: Our data suggest that the annual incidence rate of VFA is <0.7% per year in subjects younger than 60 years of age; however, it increases to 1.6% per year in older subjects, thus suggesting that the monitoring frequency of glaucoma patients may need to be adjusted as a function of their age and be performed more frequently after the age of 60 years
Authors and Affiliations
Tadashi Nakano, Takeshi Hayashi, Toru Nakagawa, Satoshi Owada, Hitoshi Endo, Masayuki Tatemichi
Keywords
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